If you're interested in contacting us to get more information about Pix4Dengine I would suggest taking a look at this form: https://www.pix4d.com/contact so we can get a better understanding of your need.

I will say though that Pix4Dengine as it stands is a programming and scripting necessary workflow.

With a project of your size it is likely necessary that it will need to be broken down into smaller chunks in the 2000-4000 image range and processed separately for best stability. It may honestly be better to manually split the project into either subflights or based on region and run it through a regular license one subproject at a time and merge the dataproducts in a post-processing software.